Secondary and Cumulative Impacts Master Management Plan

Article 11 Environmental Standards

11-31 Little River Water Supply Watershed

Wake County Unified Development Code

11-11

Standards

Critical Area

Non-Critical Area

Rural

Urban

Rural

Suburban – New

Urban - New

Existing Urban

Limited

Res*

Limited

Res*

Res Nonres

Res

Nonres

Res

Nonres Res & Nonres

impervious

Private Sewer [6]

Prohibited

Allowed

Allowed if under 12%

[1] Limit may be increased to 35% if consistent with the impervious surface limitations of the underlying zoning district and the

first 1” of rainfall runoff is retained

[2] Limit may be increased to 30% if consistent with the impervious surface limitations of the underlying zoning district and the

first ½” of rainfall runoff is retained

[3] Limit may be increased to 30% if consistent with the impervious surface limitations of the underlying zoning district and the

first 1” of rainfall runoff is retained

[4] Limit may be increased to 30% and 70% (respectively) if consistent with the impervious surface limitations of the underlying

zoning district and the first ½” or 1” of rainfall runoff is retained

[5] Refer to minimum state construction standards and inspection requirements

[6] Point source discharge is prohibited in basin

[7] Municipal sewer is allowed to protect public health when private systems fail

[8] Lots created after 7/01/2001 are subject to Wake County stormwater management regulations.

[9] Required if over 12% impervious, public or private maintained

* excludes public, civic and institutional uses such as colleges, schools, public libraries, museums and art galleries

11-31

Little River Water Supply Watershed

11-31-1 General Requirements

(A)

All residential and commercial properties require a preliminary site plan to be prepared by

a licensed professional engineer, surveyor, architect or landscape architect in order to

initiate the permit process effective July 2, 2001.

(B)

An as-built plan prepared by a licensed professional land surveyor is required for all lots

before a Certificate of Occupancy may be issued.

11-31-2 Lot Sizes

(A)

The minimum lot size for all residential lots in the Little River Water Supply Watershed is

40,000 square feet per dwelling unit.

(B)

The minimum lot size for all nonresidential lots in the Little River Water Supply Watershed

is 40,000 square feet plus 40,000 square feet for each additional 1,250 gallons per day or

portion thereof of anticipated wastewater generated in excess of 1,250 gallons per day.

11-31-3 Impervious Surface Ratios

The following maximum impervious surface ratios apply to all nonresidential development in the

Little River Water Supply Watershed:

Zoning District Maximum Nonresidential

Impervious Surface Ratio (% of lot/site)

R-80W

R-40W